Hidden behind a Target are pillows of cooled lava that formed at the bottom of a deep lake in the Mesozoic Era.

A human attendant once directed car traffic from this structure before automated stoplights.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Now the final resting place of prominent artists and musicians, it was originally founded to separate the rich from the poor in death.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The little-known final resting place of one of America's greatest writers.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

All that remains of one of the Civil War's more deadly POW camps is a simple flagstone.

The Binghamton area is home to six of the last remaining hand-carved vintage carousels.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

It would take 35 firetrucks to fill this enormous glacial pothole.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This landmark building is now a vibrant performing arts space with musical acts from around the world.

A temple belonging to the largest Buddhist order in South Korea nestled in the middle of New York City.

Head past the aisles of tropical fruit and imported candy at this bodega to discover a hidden, weekends-only taco stand.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

The world’s first penitentiary, meant to be humane, drove men insane.

One of the last taxidermists in New York City.

The oldest continuously inhabited street in America.

The Vermont square that inspired Shirley Jackson's "The Lottery."

The building that inspired Shirley Jackson's "The Haunting of Hill House."

A bygone village occupation lives on via this quaint public chalkboard.

A beautiful, creepy 19th-century castle stands incongruously in rural Vermont.